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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16f5cb35bd744c8c0c2d8f5114962bdf3875881aa6efce4119a4aca9f7b4965d' 
  AND token = '4eFD+oQaIBfmtxUWt9AFPYkKbSlhOwDLQFyqgGEXtnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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