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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c155df8c9d98d88629628ab9b3d84eba072772ba2c1dd3420d24f2f7bc2e0f' 
  AND token = 'AcE0PNDZcX/yUyb+wAFYf4ePXjB2grZVBXxYQCDatzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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