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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0627a4cab2ac2b44d3e79eacc6f230308c0ab1d4ba5e2f254e7611df108cf897' 
  AND token = 'GWZXJLjo36Y5Yi79lKIQ2RoHhInfjwOPIAA14WJemRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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