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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6327dc272fe36ba07659f5afde7a97be69f774ebe10b279e06164a0c8413669' 
  AND token = 'ba7lpRBMc0lzEe3bZ1E4xtYH4QfLJMgLD9JR2r80fLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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