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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2939db53754abf1576204632cb7b2002f465615269415a75861b381116c70d00' 
  AND token = 'SaEri37yPd4dhCQpmmj38jxNKo43mSOGYAnpWFMkBTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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