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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a42cb3f3e8510534d6cc55df82dbcfddd8b8a834b8a537db3ce0a32b6fdf62' 
  AND token = 'VsCM7bdR4XKlHP+1wprWc8YCqrVNTyLx65V+K10i6rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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