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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc66b0a3e959e3a18a6fee60b0303858a5c3091661436c1a163154da9a28968' 
  AND token = 'Spq4bvtAOEpLS4LuvPZQ2EV2QctE5PopEovGG2+OUL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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