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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec6e6460d13ca3ea5df143fdd10c8ac0560e0a67d4d00b5822c3ede3b9533866' 
  AND token = 'PvT7s04Rin/54NYcbp0riUqHCDNk2v6sdx3R7kpRRAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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