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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e11a05ab8fd245121aa3a59ea0e3d2f5b3d4fad665558707eaa2f28e4e9e3f' 
  AND token = 'vm+Jty2U3j666k9ZAprTozyZ2eb1zvVnu8UX8feujlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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