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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0189d9a72b19db7b953f2e304409e21a5b6e5167742f5d936dde75e038ef44ee' 
  AND token = 'HcbTdMTQIR1D5hKvGK+wl1Df09oretSWnY+Ds96ydzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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