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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4387a3dab473728eca04107ac1bbc9e6df5c0a981d3d212450b70a19ebd2314a' 
  AND token = 'C2ZWVymnCA0MsrmaT74WoRq/TOAsJg7L9Tiwq32pNGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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