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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fbf06c5bfe7e88f6b0c55c3e05bdf5b0c024a330e74b3b97b80efa0d131b08c' 
  AND token = 'Hh0neNYCh3MmWfsT1Iz2X7WdPRtsDNhAUjpfatE5KWE=' 
  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"
    }
  }
}