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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df2be1d33b4da437348414ba072aebdf2a51aac0fb7d2a029e97f95d301491c' 
  AND token = 'qR7elIWRinXLa899hWexQnL2XODfXP4jkqxGU1RT6aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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