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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e8b44476c4d2ccef3ca6d16284e43adbd2962deceb6b8715a7d815cf2f7eba' 
  AND token = 'lmDAgUsJJCqpbTmWbyHi6fNFXK0acLbX16Fkwx9Dod8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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