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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361c84f6d1c28a5a3a0fe6d92ca56ee8086b48f026a9f9eebb8c8468d2eaa089' 
  AND token = 'BeSVyXTXFBTz1UWbXoOxBITKWAM2eJW8uxtnluGP3ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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