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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa5cb9edafdd3f16d9a83c762c6317b7000c03f57bafdb0e05a5afb459bf481' 
  AND token = 'Mg6XknHRk/7z4bQiJUt2OO5WDJX7GCsa4Ci6j7m+CYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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