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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e65ea8ca69a6ca66f8b6eeadb38ac7260ecf71df5f5e2809b321297d4b6fdc' 
  AND token = 'YWjv0BlsHN8CCZl+ybn54sg2RTZrNv84bgGKKcQnfGg=' 
  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"
    }
  }
}