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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec79b7257cf4a04fc5f7e8e5b3eb8f5c378f23c64db2f43c1f9ec895c36ee79' 
  AND token = '1gC+49KjUjyoXUXdcsCHEJEAXEBsoPNY+V7A4zE2hNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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