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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad1342660bbe94545ae34ee5648ce2dfc66cf7c714165788c26cb4b836600f0f' 
  AND token = 'poLZ664qHJ+x4VLCn5Dhgz0shOUGpysWkoPO7AHZ+GE=' 
  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"
    }
  }
}