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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c655acc3f9994b7613f4a34263f6e902882cdc4dd24bda99fdab3e7d8c731a' 
  AND token = 'Usv/VXZk7HIVp3eLpolh727SWebb8rbVegn8YiED3SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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