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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b55ce4a1949d1b3e587885db4a63fcb536062809b86049094ee0947cc8803a63' 
  AND token = 'AuYXvTJ3kur4VsUWcyYBbOG4zVW9JpVpaZT+6R3g27k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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