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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a377f43c23dbbd1b64e50d5a5b137665e387c3935f411b9dccf5e7e0237607' 
  AND token = 'e3IH29FPK/KhpUrUDvvtDJWgyMpOcK84eA1uoJc8GpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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