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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0917ee2e85c7e6e8b9f485b2ca41e8af9f375841ae5d722de40d56b6be5de11' 
  AND token = 'I6/UffLGmsv7a1+fla+bX0/OIK9JCxZFYVVCLzw1alM=' 
  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"
    }
  }
}