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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c933640982fb5b9c867dafd300320b158e535ed5dd7ec394c0722dfc9f9992' 
  AND token = 'LhVrSZsVtENkyfC9o23I7oX6g/00Ja8t6Y7JWMFRJXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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