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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99160849fc0c06965171bafbde12e07022e8ef127bb30f2c2ac94c66bfd0e3d' 
  AND token = 'cPdU2s2aUaFn/lTvBDxAHB7MoSaBJbf8pj83vmh+ssE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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