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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2c42d053247d502a1da3f1d3806b6e2e9835829b7dbec0c1bb7bc5edf26739' 
  AND token = 'MzUxjdWwaWAVnHL+ZfTKDiLadOQOM8d59Qsrvt19zRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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