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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3adccf6f9eddec0bf5ec14f593123c8695b045bed9e97c97902a071c76ca88e0' 
  AND token = 'sZO72fljsA4S3PJKoD3eKM3T75+Paxs8Z/hXMu13QPs=' 
  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"
    }
  }
}