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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e888281ba17a979195fea6c775de6b0c9851221ef22f3a615d2163fe45b6ff' 
  AND token = 'gc/anu36f9HTr2gX6+/0pgcVxVjIi02sNj9ZOXcfvsU=' 
  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"
    }
  }
}