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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92310c8dcb25806deec62058570cb7088f940c1b550ce86d08c3d7d0e2e819d' 
  AND token = 'N5wR5hltNxwp9LRKknE+FHqRDDsF85tY4A44g0SNQ04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}