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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd47943a718dab10941eb523e5084d22e00f332940f8d944866a19aa47c4436b' 
  AND token = 'tJkqGfYq8XxWJDMA60M2CAPkZKsTAOPQOxHq0vZpum8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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