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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606ddf312a1d5f13acca525b9ae8c6650a1b898f54ff4443b9c7ae6195d3c3d0' 
  AND token = '+UEMlc2EyMW3eV0eT1qUOtF3O5KeIcyg3DlrtWI9KOQ=' 
  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"
    }
  }
}