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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13b0aec6aa9542a0637fea4c6d6b20d1004d67cf4e85e0ae940beb536bc9821' 
  AND token = '59DqXfdY3OEgHHN++mX+Gp4Hyc1Bi/UtiOIX/x0y7yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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