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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937bb6a8b2f1e55cd6e0873510d03a1dce4a113fa11dc8853080095c6c8c6147' 
  AND token = 'wglE8YGQvDwes0+pVwh2hH/1Sm5ejneznm2o7ymb6/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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