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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ce8da273cee1057c4068cd787c453c70c320aa212694048704631578ba51c0' 
  AND token = '3LuMZtC/T8jZqj5BgirRQIgEZfyR1Mp+ffvu8/Zkwmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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