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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '516e3acc252a0eb75cf64907d3d6e4b129f3ef594f39cc46e1d5e6e1f8247114' 
  AND token = '2KqErr2kEmXxldbHuCBrXUSBrOgheBVcZUHDkelI8HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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