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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90e8a9558b979994c882ce99ddddcb1bddc59fb6b54028e54e1b628469f0c21' 
  AND token = 'H95yJG0NTWNgy1h+Oy1CyNowwKHB6pVY4d+4tvTS7kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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