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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6ee38c3d49ce44fd1f5a2af72c6573fd61978674eb2515910873d73ee5b308' 
  AND token = '4omXHXGoDJ5PW1oQZE54Btgu1Yl5E5LCHKzpGMkCIRg=' 
  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"
    }
  }
}