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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '389eb78908f930204a9a3f021d69649839a3a61a4cc076e8d53b72de067a912d' 
  AND token = 'AW3RUvxOmWYCwOpUPNQVj7T5rhRpks80ixYTO+OWzps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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