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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ec8f2d96062530ad246dcd9f710f0afd4833738d39fd83c29e7462556e60741' 
  AND token = 'cXrushVhDFdBAezVn+29U3OMpddECsd1cqkA/SNTJ78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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