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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1104392224d5b0e4d1741da7771cfa70f39b56c35c056be8193313a2ee95edf' 
  AND token = 'pf8OCWFsnqEY5QeXAUTBGAmJLVHNZ0FndrK78rzR5T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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