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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83a23de454567dd75cd920a2b24c219ebbfc20bf1a058992a39987400907192' 
  AND token = 'v2E4YU4C9BXtb2w8Au3BJCqIb30GJKAYpDiLhI4th/s=' 
  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"
    }
  }
}