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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90aef601196b9cc346c17a64567279dc944f78d68b72616aceb3728da6a0cc39' 
  AND token = 'M1oJhnNaTh35/Ldcu6XCJEQesi7CiWH5k+YyTAFKxmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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