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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75895bb751ab39f43a18ba06c450ac2135c7e5666ce1eae2b1b3dc278693fe02' 
  AND token = 'YPhxk2+uilEeCf2CPWm9VjDycXhtF07FQlQQYu2c0Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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