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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f3d9a3a9bf50683a4c0540bc9c618950e5834a920269b841d32e2e6d4c48bb' 
  AND token = 'r/AECP/Ys3XB9p8W/Qi7H8ayNJtlFnaZzoxte5n0nM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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