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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd312e8a83462825263e608eeab47166fa3276873479c562c791483ba3552d5e6' 
  AND token = 'W4kLDEIlNfB4k0+Vb3AVx8Ej7E75DD9XVVDmOPsWLfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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