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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '558dffa296a0165e32e746ac23078ec6a891da2bdbe014b87b4a8800508c6cea' 
  AND token = 'w2k29omWL71zwSmpZ9aO8np77RHXpwKtvUpQYGtr7VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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