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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c7467fc5a4cadf2344b77caef4aed533abeb7ece866029fe43fedb7f8d4cf3b' 
  AND token = 'O43K2Sn+cIYk82lZcV2TUnm4FQh948nKnkn1qqTZs10=' 
  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"
    }
  }
}