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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '901dce505f4e7c55349a7cc40aaa01acb1474a2a6bd190a1142d704edad1afd6' 
  AND token = 'W65bO2UwkNEn7WkN5CTZZPAfHk5r8XBAo1Nb5oz4Ozg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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