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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e983dcd8a2c03813bcece7ca1b426fe899dc3fbc5952e99bc29dbfe8996d629' 
  AND token = 'eXwWAxxV4SNAN5NIbtIpQ/vlf97w6Lc2U81K/9QZFOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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