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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '010f49fd0c51e594e21ed156e47997f43546dc1528cce17c821fcbff03f360b1' 
  AND token = 'Z5Ty6VRXbiBmpGXA0OHuOzYZ8vdAuNAVPkdLUuchtOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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