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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11b21574a3b22d10db8a474c8d4f3d7e4945362ae2e2f510cc5521da27ec505c' 
  AND token = '4L5rvMHwlluvipD16fgJnUbJoKfebQjQpoUOIZn69Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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