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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fc8875150fb6df27b85e3f31d8778adfd1e2010c5333f30fbca899f10dcefa' 
  AND token = 'NcEWM0zH7YknZoQM538JG2hdu5dKdSkpYeZAuP53Bes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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