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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a8d7c07e311c7133a0b6f2e914be6a2523482fc31d991bdfe6c4a72e3818dc' 
  AND token = 'tp5v40oveg4r+LvSmBGlARIuHc0kyOHYK+4gY33FVd4=' 
  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"
    }
  }
}