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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d8035c526b75d5e16b1630f8925e8c2375c7afa0ebd5c1d39e40cfa47c876bc' 
  AND token = 'L+m+xvqPsta7P8zqw3OGmz7NsuboTcsBtiF3cR9PUq8=' 
  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"
    }
  }
}