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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb3c26a834e2cf30cf9034c94c230ed68c3b58cd96410e007f401813b86e07b' 
  AND token = 'rMkIdAIcGOAUPrW6nQk1TGOcfD6ZLx6X/kl1Ygae3IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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